78165855434 has 8 divisors (see below), whose sum is σ = 117301771620. Its totient is φ = 39065264896.

The previous prime is 78165855431. The next prime is 78165855457. The reversal of 78165855434 is 43455856187.

It can be written as a sum of positive squares in 2 ways, for example, as 51598485409 + 26567370025 = 227153^2 + 162995^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78165855434² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78165855434.

It is not an unprimeable number, because it can be changed into a prime (78165855431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8825879 + ... + 8834730.

Almost surely, 2^78165855434 is an apocalyptic number.

78165855434 is a deficient number, since it is larger than the sum of its proper divisors (39135916186).

78165855434 is a wasteful number, since it uses less digits than its factorization.

78165855434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17662824.

The product of its digits is 16128000, while the sum is 56.

The spelling of 78165855434 in words is "seventy-eight billion, one hundred sixty-five million, eight hundred fifty-five thousand, four hundred thirty-four".